2020. 3. 18. 23:23ㆍ카테고리 없음
The was released on May 16, 2016 after 39 months in the making. A great deal of new research has been published during the past 20 years and there was a large amount of new information for many nutrients that needed to be documented and evaluated. New chapters were added to this revision, including US beef cattle production; anatomy, digestion, and nutrient utilization; carbohydrates; lipids; and environment. Since 1944, the National Research Council (NRC) has published seven editions of the Nutrient Requirements of Beef Cattle as listed below. This revision builds on previous editions and provides the latest cutting-edge scientific knowledge of beef cattle nutrition.Revision History (Tedeschi et al., 2015):. In 1945, the National Research Council (NRC) released the “Recommended NutrientAllowances for Beef Cattle” (NRC, 1945), in which the requirements for protein were based on the factorial concepts previously delineated by Mitchell (1929). The first revision of the beef NRCpublication was released in 1950.
In addition to the 1945Beef NRC, the “Recommended Nutrient Allowances forDairy Cattle” was also released in 1945. The beef NRC had the second revision released in1958 (NRC, 1958). The third revision in 1963 (NRC, 1963). The fourth revision in 1970 (NRC, 1970). The NRC(1970) included a new section on “Nutrient needs of rumenmicroorganisms”.
The fifth revision was released in 1976(NRC, 1976). The sixth revision was released in 1984(NRC, 1984). The NRC (1984) had major changes in theenergy requirements section and included the concepts ofruminal protein degradation and bypass.
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The seventh revision of the beef NRCwas released in 1996 (NRC, 1996) and updated in 2000(NRC, 2000). These versions of the beef NRC included morecomplex and mechanistic nutritional models. The eighth revision of the beef NRC was released in 2016 by the National Academies of Sciences, Engineering, and Medicine.Click to start a tutorial on how to use the Beef Cattle Nutrient Requirement Model (BCNRM, 2016).Microsoft Excel 2007or laterversionsThe “Beef Cattle Nutrient Requirements Model 2016.EXE” is a stand-alone software that will install the Beef Cattle Nutrient Requirements Model (BCNRM) on Windows-based computers. The BCNRM requires Microsoft Excel 2007 or later versions to be executed. The user must have administrative privileges to install the BCNRM.
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A computer with the following configuration is suggested for satisfactory performance: 2 GHz Intel Core Due (or similar) with at least 2 Gb of RAM.